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First 100 days: Obama in London

The AP: "As President Barack Obama sought to rally the world's powers to fix a lifeless global economy, the White House announced Wednesday that Obama and Russia's president were ready to negotiate on reducing both nations' nuclear arsenals. The flurry of diplomacy came as Obama stepped on the world stage for the first time as president, aiming to shore up both America's economy and its reputation across the globe. The White House confirmed that Obama and Russian President Dmitry Medvedev would announce new talks to limit the number of nuclear warheads, the first major negotiations in years over what Obama called the gravest threat to humanity."

The Guardian: "Barack Obama arrived in Downing Street this morning for talks with Gordon Brown as both the UK and the US faced demands from other world leaders calling for significant progress on financial regulation at tomorrow's G20 summit. The president, who was accompanied by his wife Michelle, was driven up to the door of No 10 shortly after 8am, where he was greeted by Brown and his wife, Sarah. Unusually, Obama was cheered by Downing Street staff as he went inside for breakfast and talks with the prime minister."

The New York Times on the Obama-Brown newser: "President Obama denied there is a rift between America and the world on Wednesday and urged leaders of the Group of 20 countries to act in unison to find a way out of the global economic crisis."

The Obamas walking down the steps of Air Force One is the centerpiece photo on the cover of the Boston Globe.

"The president arrived in London on Tuesday night with his wife, Michelle -- who has generated almost as much interest in Europe as he has -- and was due this morning to plunge into what is sure to be a delicate and testing round of diplomatic meetings," The Hill writes. Obama has tea with the Queen this afternoon.